The biggest concern before Apollo 9 was the docking maneuver.In early 1969, at NASA there was little confidence in the docking system. At a January program review, Phillips said that problems encountered during probe and drogue testing worried him…

The Command Module probe and the Lunar Module Drogue

McDivitt & Schweickart practice in the LM simulator

Schweickart in the spacesuit with the backpack

Lithograph print of the negative that flew on Apollo 9, with signatures of Grumman engineers and mechanics